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Figure 34--Volume of softwood growing stock on timberland by stand origin and diameter class, Southern United States, 1999.

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Volume in billion cubic feet by diameter class (in inches) for artificial and natural stand origins:

Diameter-class	Artificial	Natural
5.0-6.9	5.710	5.457
7.0-8.9	7.059	9.545
9.0-10.9	4.907	12.072
11.0-12.9	3.002	13.313
13.0-14.9	1.746	12.321
15.0-16.9	0.960	9.919
17.0-18.9	0.481	6.759
19.0-20.9	0.207	4.410
21.0-28.9	0.157	5.569
29+	0.006	0.700